Hex Bolt ASME B18.2.1

Hex Bolt Dimensions ASME B18.2.1 Standard Thread Types Unified coarse (UNC) and fine (UNF) thread series are included in the standard. Sizes Covers bolt and screw sizes ranging from 1/4 inch to 4 inches in diameter. Materials and Grades Materials such as carbon steel, alloy steel, and stainless steel are commonly used, with strength grades specified based on application needs.